Could someone please tell me how to go about finding information on a his & hers matching set of 1978 Cartier "Diamond Jubilee" watches? They were given to Ford Lincoln Mercury Dealers with the highest per cent accomplishments. I'm wanting to price them & don't know if a jeweler could help me or, if because this was a special watch set, if I need a specialist. The watches are engraved on the backs & the fronts have the dates 1903-1978. The finial has a sapphire & the gold is 18K. I don't believe the men's watch was worn but, the ladies was. The watches belonged only to my grandparents. Thanks.

the pair

a close up of the faces

a close up of the backs...sorry the images aren't that great...having troubles